Hey racefit, let me know if you try it. I have a 2.4" on-one chunky monkey currently mounted on the rear of my Riot and on a 35mm rim and it measures right a 65mm wide (wider than my 2.5 DHRII WT). Lots of room between the seat stays but the chainstays are where it might be tough to fit a bigger tire. Right now I have 4mm on the non-drive side and 3mm on the drive side. I do not get any rubbing under load but if the tire was much bigger I might. Still, I may try a 2.6" specialized Butcher and if it does not work then I'll use it as a front tire eventually.